package com.xizi.forum.config;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.xizi.forum.common.AppResult;
import lombok.SneakyThrows;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.MethodParameter;
import org.springframework.http.MediaType;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;

@ControllerAdvice
public class ResponseAdvice implements ResponseBodyAdvice {

    @Autowired
    public ObjectMapper objectMapper;

    @Override//supports⽅法: 判断是否要执⾏beforeBodyWrite⽅法. true为执⾏, false不执⾏
    public boolean supports(MethodParameter returnType, Class converterType) {
        return true;
    }

    @SneakyThrows
    @Override
    public Object beforeBodyWrite(Object body, MethodParameter returnType, MediaType selectedContentType, Class selectedConverterType, ServerHttpRequest request, ServerHttpResponse response) {
        if(body instanceof AppResult<?>){
            return body;
        }

        if(body instanceof String){
            return AppResult.success(objectMapper.writeValueAsString(((String) body).getBytes()));
        }

        return AppResult.success(body);
    }
}
